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1,322,532; mallteam, 25, 1919.

X 2 SHEETS-BMU I.

" Y Y Inventar,

B7 i @zu /arney t. CAMPBELL.

GRINDER.

Awucmou min lm' 2o. 191s. 1 ,322,532.- Y Y Patented Nov. 25, 1919.,

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, VY y w\ l vq t i ff Jaya A'useful improvements in UNITED STATES PATENT OFFICE.

EDWARD B. CAMPBELL, OF ST. L0`UIS, MISSOURI, ASSIGNOB T0 THE WILLIAMS PATENT @RUBBER AND PULVEBIZER CU., 0F ST. LOUIS, MISSOURI, A CORPORATION 0F MIS- SOUBI.

Specification of Lettera Patent.

GRINDEB.

Patented Nov. 25, 1919.

pplioatlon Med Hay 20,1918. Serial No. 235,583. a

To all whom it may concern.'`

Be it known that I, EDWA D B. CAMPBELL, a citizen of the United VStl tes,'residing at St. Louis, State of Misso i, have invented certain new and -useful rovements in Grinders, of which the fpllowing is a specification. l.

This invention relates to certain new and inders,4 the peculiarities of which will l e hereinafter described and claimed.

The ymain ob] ect of myimprovergnents is to simplify construction, increasethe eiliciency of t e grinder and facilitate adjustment and 1e lacement' of the parts.

n the accompanying drawings on which like reference letters indicate corresponding parts, Figure 1 represents a grinder embodying my invention, shown-half in front view and half in vertical sectional elevation parallel4 with the Shaft; and Fig. 2 represente a' vertical sectional elevation on the line X of Fig. l.

In the grinder at resent considered I have shown the 'front p ate A, the back plate B, and the sides Gand also the top cover D as formed in one piece as by casting integrally. The sides have large openings'E through which the'shaft F with the disks G keyed thereon, which disks carry the hammer rods H that support the ivoted hammel's I, constituting the cylinderV-may all be inserted within said housing. vIt is then adjusted to proper central position with re spect to a perforated or .other form of cage J.

This cage has heretofore given considerable difficulty when it was desired to remove it, and in this ap Iication I have shown a The said slot extends from the front to the i back nearly the half circumference below the horizontal plane through the shaft as shown in Fig. 2. The upper side or edge of said slot constitutes a bearing surface for a cage J and is preferably provided with a flange L on the inside of each housing that extends from the-back around upward toward the frontalid ends belowthe entrance M at the top of the casing above which is indicated tightened.

used with this grinder. The flange widens the bearing edge for the cage and stiii'ens the side casing. he lbottom edge of said slot is preferably beveled from outside inward and upward, so that the cross section of the slot presents a wedge shape opening, in which a correspondingly arched and wedge shape filler piece O is mounted. This fi er piece with its wedge sha e bottomfinatching the bottom of the said s ot K, and its upper edge fiat or otherwise corresponding to the shape of the cage J, acts to support the cage and hold it firmly against the upper side edge of the slot K, with equal radial pressure along the len h when the rods P, passing through both fi ler plleces and below the cage, are

he wedge-shaped filler pieces are drawn toward each other and thus exert a radial pressure slantingly inward toward cent to a' ledge Q, at the, front plate near the horizontal plane and connecting the sides C'. In the ledge at its upper surface is formed ,a socket g, preferably semi-cylindrical, and in this socket is mounted the rounded end of an arched breaker plate R, the front of which on the inside is provided with serrations, horizontally disposed, and ,preferably increasing in size from the lower end upward lto the top as shown in Fig. 2. The top of said plate is formed in an arch about the center of the socket end, whereby the plate may be adjusted inward and outward at the top by suitable means, below a cross bar S connecting the sides of the casing and flanged as shown, for stren h and the attachment of the feeder be o re mentioned. The top of said breaker plate extends backward in an apron or flange r and on the arch about the center before mentioned. At the back of the flange are depending hooks T, set a suitable distance away from the sides as shown in Fig. 1, and forming anr open slot below the flange r adapted to re- 65 by dotted lines at N thefeeder thatv may be shown in Figs. 1 and 2. When the ends U 110 of said rods are positioned horizontally in engagement with the depending hooks T,

` the breaker plate may be adjusted by varying the location of the jam nuts on the threaded portions of the rods. Fig. 2 shows in dashed lines the drawn outward position of the breaker plate which is required when certain kinds of feed are supplied to the grinder. When the breaker plate has worn, or liner grinding is desired, the top is adjusted inward toward the hammers l; the apron-arched top of ,the breaker plate thus overhanging the hammers and piroted bottom end is adapted to deliver theI feed from the upper end of the serrated front into di rect path of the hammers. The apron and top of breaker plate thus take the place of a slide valve for regulating the size of inlet from the supply hopper above. Drawing the breaker plate outward allows more space for feed to enter'from the hopper and also increases the angle between the plate and the path of the hammers. Adjusting the plate inward reduces the supply opening and likewise diminishes the angle between the plate and path of the hammers, and ac cords with the lesser amount received from the supply hopper. The cross bar S holds the breaker plate in position, but il desired, the bottolu end mayI likewise be engaged at each side by a set screw 2, Fig. 3, tapped through each side and into engagement with the bottom end of said plate. 'hen it is desired to remove the breaker plate, the bent ends U of the adjusting rods are turned downward out of engagement with the hooks T, which allows the top of the breaker plate to swing inward till `the apron 'r is clear of the cross bar S. The dotted line in Fig. 2 showsJ a recess 3 from the serrated frontyand arched to correspond with the ledge L to allow of this forward movement of the breaker plate, which in this position may be readily slipped upward through the feed opening M. This arched breaker plate does not require extreme nicety of fitting at the socket or the apron top` but ma)r be ground on the einery wheel where necessary; a tight tit is not necessary at the .sides of the breaker plate and tbe sides of the housing, as the projecting ledge L acts as a guard to direct the material awa from the sides. It will be noticed that the lower end of the breaker plate practically alined with the adjacent end of the cage.

claim l. ln a machine of the character described, the combination with a casing having a feedbpening at the top, of a piroted breaker plate located below said feed opening and adjustable at the top across said. iecd opening and oven-hanging the bottoinl end and havin a ange at the to n concentric with the. pivot and extendin f ackwardl outside the feed opening, an. nclinin downward toward the front to guide an regulate the feed passing through said opening, and means to secure said breaker plate in any rotated position.

2, A machine of the character described comprising a casing having a front plate, a horizontal ledge on said plate near the hori zout-al plnne,-said ledge at its upper surface having a semi-cylindricalsocket,a 75 breaker plate having its bottom end rounded tQ match said socket, and means to adjust said breaker plate rotatably in said socket.

3. A machine of the character described comprising a shaft, a concentric cage, a easso ing having in each side housing an arched slot with a concentric inner side edge engaging said cage and an inwardly beveled outer edge forming a wedgeshaped cross section of slot, a filler piece arched to {it each slot, and having a similar wedgeshaped cross section engaging said cage and beveled outer edge respectively, and cross rods passing below said cage and through said filler Jieces, and exerting inward radlal pressure along the edges of said cage.

ln testimony whereof I have aliixed my signature in presence of two witnesses.

EDVVAHD B. CAMPBELL.

W itnesses H. M. PLAISTED, 4 CHESTER SPAULDING. l 

